My Sigma 70-300 autofocus has stopped working on my Canon EOS 3000. There is a little buzz as it seems to try to work, but nothing happens. The main 28-90 Canon autofocus lens is still working OK. I've tried cleaning the contacts on both the lens and the camera but no go. The manual focus works OK still. Any advice? It's several years old now and I mainly use a digital camera now but it's a pity - a good lens.
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Re: 70-300DL Macro Super autofocus problem
It is likely that the lens will need parts. Sigma is not the best for repair parts. Typically, the small nylon gears that control the AF break. It is still a useful piece in manual focus. Repair costs would likely exceed its value.
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If those lenses have a Nikon mount then they will fit on the D3000 and D3100. However, the D3000 and D3100 lack a focus motor. If the lens does not have the focus motor then you will not have the autofocus capability. Sigma calls their focus motor the HSM; if the lens does not specify HSM then they do not have the motor.
if the lens is the older type with a macro switch which has 2 screws
holding it on to the lens it will not work.If it a super 70-300 you can
put the camer on AV set iris to F22 if you have a stopdown button
see if the lens stops down it ok if noe it will need a rechip or a new
(From Sigma lens literature) Capable of macro photography, this
lens has a 1:2 maximum close-up magnification at the 300 mm focal
length. It's the ideal high performance lens for portraits, sports
photography, nature photography, and other types of photography that
frequently use the telephoto range. It also has a switch for changeover
to macro photography at focal lengths between 200mm and 300mm with a
maximum close-up magnification from 1:2.9 to 1:2. The minimum focusing
distance is 1.5m / 59 in. at all zoom settings.